Asus M2N-E CMOS making PC unable to boo...

Hi. I'm using a Asus M2N-E motherboard and when I do a CMOS HDD's start to spin Fan of VGA Processor and main fan also start spinning but there is no picture on the screen and it seems the bios doesn't start up. About half a year ago I had the same problem but I couldn't solve it so I brought it to a technician but couldn't see what he did in order to be able to do it my self. I'm pretty sure there's nothing wrong nor with my VGA card nor with my Monitor since they were running just fine today. I was trying out some things and the PC freezed so I decided to shut it down and start up since I don't have a reset button but there was no response from the button and shut the power from it directly. Thought first that my CPU got fried but still restarded the CMOS and again nothing happened. After a few minutes I checked the cable connecting the button to the mother board and it was disconnected. I reconnected it and it started but it seems like I got a system boot failure and don't know how to fix it. Please do help me .